Articles | Volume 15, issue 3
Research article
09 May 2019
Research article |  | 09 May 2019

Cold vs. warm water route – sources for the upper limb of the Atlantic Meridional Overturning Circulation revisited in a high-resolution ocean model

Siren Rühs, Franziska U. Schwarzkopf, Sabrina Speich, and Arne Biastoch

Data sets

ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis C. Amante and B. W. Eakins

Quantitative ARIANE trajectories for the upper limb of the SAMOC calculated from 5-day mean velocities of hindcast simulation KFS044 with ocean model INALT20 S. Rühs


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Short summary
We revisit the sources for the upper limb of the overturning circulation in the South Atlantic by tracking fluid particles in a high-resolution ocean model. Our results suggest that the upper limb’s transport is dominantly supplied by waters with Indian Ocean origin, but the contribution of waters with Pacific origin is substantially larger than previously estimated with coarse-resolution models. Yet, a large part of upper limb waters obtains thermohaline properties within the South Atlantic.